Difference between revisions of "OPTION BASE"

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' Declare an 18-element two-dimensional array with element indexes of zero through two  
 
' Declare an 18-element two-dimensional array with element indexes of zero through two  
'for the first dimension, and 10 through 15 for the second dimension.
+
' for the first dimension, and 10 through 15 for the second dimension.
 
{{Cl|DIM}} array(2, 10 to 15) {{Cl|AS}} {{Cl|INTEGER}}
 
{{Cl|DIM}} array(2, 10 to 15) {{Cl|AS}} {{Cl|INTEGER}}
  

Revision as of 17:51, 1 March 2010

The OPTION BASE statement is used to set the default lower bound of arrays.


Syntax

OPTION BASE {0|1}


Description

  • This statement affects array declarations where the lower bound of a dimension is not specified. See DIM, REDIM, STATIC, COMMON.
  • When used OPTION BASE must be used before any array declarations (DIM).
  • By default, the lower bound for arrays is zero, and may be changed to one using the statement.
  • Otherwise, arrays will be dimensioned from element 0 if you DIM just the upper bounds.
  • You can also set other array boundaries by using TO in the DIM such as: DIM array(5 TO 10)


Examples

' Set the default lower bound for array declarations to one. OPTION BASE 1 ' Declare a 5-element one-dimensional array with element indexes of one through five. DIM array(5) AS INTEGER PRINT LBOUND(array)

1


' Set the default lower bound for array declarations to zero. This statement has no ' real effect, but it may be useful to emphasize the default behavior in order to ' eliminate any chance of confusion. OPTION BASE 0 ' Declare an 18-element two-dimensional array with element indexes of zero through two ' for the first dimension, and 10 through 15 for the second dimension. DIM array(2, 10 to 15) AS INTEGER PRINT LBOUND(array, 1) PRINT LBOUND(array, 2)

0 10



See also



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